My neighbor walks up today and asked for my input since he's seen me out under the hood of my own cars before. He knows very little about engines...espcially diagnosis...and I struggle some with diagnosis also. So here's the run down.... He's got a very audible ticking from the driver side. When I get down there, he's already got the valve covers and intake off. He says when he was checking the oiling on it earlier, he was only getting oil to the passenger side and next to nothing on the driver side. He already had the rocker arms loose and the pushrods out of the driver side. He could press the plungers on all the lifters on that side except one...which is stuck. I'm guessing this is where MOST of his ticking is coming from....but being he's not getting oil on the driver side, I'm sure it's all noisy. Anyone ever experienced this on an engine that's been run a fairly good bit already? Should I recommend him buying a new set of lifters? Should he try disassemling that one lifter? Why is he getting oil just on one side?